1. In a mixing bowl, combine flour, baking powder, salt, garlic powder, and paprika.
2. Gradually whisk in the cold beer until the batter is smooth.
3. Heat oil in a frying pan over medium-high heat.
4. Dip the fish strips into the batter, allowing excess to drip off, and carefully place into the hot oil.
5. Fry the fish until golden brown and cooked through, about 3-4 minutes per side. Remove and drain on paper towels.
6. Warm the corn tortillas in a dry skillet over medium heat.
7. Assemble the tacos by placing a piece of fried fish in each tortilla, then top with shredded cabbage, pico de gallo, and a dollop of sour cream. Serve with lime wedges.